Enigmath Sinharaja

2 reviews

Why use an analogic slide rule in this technological age? The same reason we love tool watches - there's nothing quite like getting our hands dirty. In pre-digital 20th century, the circular slide rule was utilized to execute simple to semi-complex calculations, which you can now achieve on-the-go. Learn how to use the slide rule bezel here.

So adventurers; divide your time, subtract your excuses, add sturdy gear, calculate risks, and multiply your outdoor escape with the Expedition Enigmath.

Sinharaja Forest Reserve is located in the south-west of Sri Lanka, a treasure trove of protected endemic wildlife & plant species in just 88 square kilometers of land. The landscape has been described as ‘a series of ridges and valleys intertwined with a network of streams flowing into surrounding rivers’ - absolute heaven to an adventurer. Enjoy scenic trails like Moulawella and Sinhagala that wind through dense jungles, while bird watchers can observe over 140 species that include Sri Lanka’s own blue magpie, white-headed starling, and green-billed Coucal, amongst many others. Put aside the screens and prepare for an unforgettable immersive experience.

  • Case: 316L Stainless Steel with sandblast and polished finishing 
  • Movement: Japan-made Miyota 9039, automatic, self-winding, hacking seconds, 42-hour power reserve, 28,800 bph. 
  • Water Resistance: 200m (660ft) / 20ATM
  • Crown: Dual screw-down crown with custom embossed BOLDR logo
  • Bezel: Inner rotating bi-directional bezel
  • Dial: Ombré Green matte-texture dial with Swiss Superluminova BGW9 
  • Hands: Custom hands with Swiss Superluminova BGW9
  • Lens: Chamfered edge sapphire crystal with Anti-Reflective coating
  • Strap: Jungle-Green canvas strap
  • Case size: 41mm (Diameter of dial)
  • Case thickness: 12.8mm with glass
  • Lug size: 20mm
  • Lug to lug: 47.5mm
  • Case Back: See-through case-back with custom artwork
  • Individually numbered 

Any BOLDR watch purchased from boldrsupply.co may be returned within 30 days of delivery for a full refund or exchange of the purchase price. This ONLY applies to watches that have not been used, worn, or strapped on. If the watch has been worn, it can still be returned within 30 days but this will incur a restocking fee of $30. Click here for more details.

Any knife purchased from boldrsupply.co may be returned within 30 days of delivery for a full refund or exchange of the purchase price. This ONLY applies to knives that have not been used or deliberately damaged. If the knife has been used minimally, it can still be returned within 30 days of purchase with a restocking fee of $30. Click here for more details.

All BOLDR watches come with a 30-month warranty on the internal movements of the watch, which excludes any part subjected to external wear & tear. External wear & tear comprises (but is not limited to) scratches on case, lugs, or crystal, and/or water damage due to negligence. The warranty does not cover straps nor any watch that is not purchased via our website or authorized stockists. Click here for more details.

All Strandberg Knives by BOLDR come with a lifetime warranty on any defects in workmanship or materials. The warranty excludes any part subjected to external wear & tear, misuse from unsuitable activities such as prying, pounding, or deliberate mishandling (eg. running a car tire over to test strength). Click here for more details.

We aim to dispatch your order within 48 business hours of verification, although this may vary according to the current workload of our warehouse. UPS/FedEx/DHL pledges worldwide delivery within 5 business days.

Available stock will be shipped within 48 hours of placing your order from Monday – Friday, 9am to 6pm. Orders placed on weekends will be shipped out the following Monday.

Pre-orders will be shipped once stocks have arrived in our warehouse. Shipment will be dispatched within 48 hours of stock arrival. However, BOLDR reserves the right to delay the shipment in the event of any unforeseen circumstances.

Size Guide:
Try your watch on for size! Make sure your print settings are set to 'actual size', and simply cut along the printed watch outline to gauge the watches' actual size around your wrist. Click here to download the watch size guide.

Customer Reviews
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Stephen W.
United Kingdom

Old School!

Really enjoyable throwback sliderule atop a beautiful green variated to black dial. Hands are “open” showing detail below. Lume is as always superb decoration and overall quality in crowns and sliding inner bezel is as I’ve come to expect from BOLDR. Watch box contents include a small circular slide rule that mimics the watch face, allowing practice and familiarisation with the slide rule functionality. Simple green canvas strap compliments the watch and I imagine a metal bracket wouldn’t look out of place if you wanted to go down that road. This is a truly entertaining watch with a genuine “beyond time” function as well, meaning you’ll get a lot more interaction with it than you might imagine. Excellent timekeeper and a comfortable wear. Just enough action across the visuals to draw the eye, but not so much as to confuse the viewer or take away from the primary function. For example, how many Bulova’s can make that claim? Not many! BOLDR have nailed it again. Pleased to own this and it already has a permanent place in my collection. My only regret is that I can’t justify owning all three colour ways. The black looks slick and the blue looks snazzy. The green, for me, fits the BOLDR ethos and is an understated yet unusual colour that suits the brief. I’d happily own the others though. I can recommend this model on all points and think it’s very safe to say that as long as you read the description and know what you’re getting, you will be very pleased with what arrives! Congrats folks!

Eddie S.

Great new tool looking Expedition watch

This is a great new edition of the Expedition series of watches. I really like the new case, the 41mm size is the perfect size and the new shape suits this watch with two crowns, one for the internal rotating bezel. Also a great touch having drilled lugs on the case. The new bracelet looks and feels high quality, and brilliant that it now has quick 'on the fly' adjustment, as well as quick release 'tool-less' on/off, and ******* links. That's good because it also looks great on the matching green canvas strap, so easy to quickly change between the two. I've also really enjoyed learning how to use the slide rule - and have already found it useful. Once again well done BOLDR on another amazing watch, that has an original look. I also couldn't resist making my own video review of my latest BOLDR watch: https://youtu.be/wsHtuidEtKM?si=wlafOL0MHOkjEPAL

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