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Hi everyone :) My very first post here on WRT and im hoping some of you clever chaps out there can help with a few things. I have an Omega pocket watch ( well actually its wristwatch size but pocket watch movement ) which im currently stuck trying to repair, the issue is not whether its fixable ( luckily ) but rather which caliber it is. I need to order a stem that will fit the watch but it is proving difficult as without a clue to the exact caliber i can not reference the right stem. I can provide photos if needed but the movement is just like a scaled down version of the 40.6 Omega that is well known to most in the business. To give a better idea the movement size is below ( measured with Vernier ). 15 Jewel Lever Escapement ( Dated 1915 ) Inner Diameter - 26.00mm Outer Diameter - 26.90mm The watch it belongs to is a WWII ? officers trench style watch. I have tried various similar omega pw stems with some success ( a cal 38.5 stem was closest ), but im still perplexed as to what to do. Any help would be greatly appreciated :) Also does anyone know of a book or somewhere online with good info on Omega pocket watch calibers ? ( i love restoring them but don't always know which cal they are :( ) Thanks in advance for any answers MrBeat