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Hello This is my very first watch service, and I need some help identifying the mainspring, and perhap also the movement. What I know so far is: BWC pocketwatch 41mm FEF movement, no serial number or any other code I can see in it. The mainspring is: 1.22mm height, 0.25mm thickness, ~51cm long. The barrel has an internal dimeter of 16.21mm. I've opened all the FEF documents I could find in the cousinsuk website, but I was unable to get my one. Can you please help me finding the replacement for the mainspring since the bridle is broken? I found this one that seems very similar, but I dunno if it would be ok or not considering that the measurements are donw with a caliper Thanks in advance for all the help. Alessio