Samson Mainspring No. 10180D for Omega caliber 35.5 - steel

Samson No. 10180 / 10180D steel mainspring for Omega caliber 35.5, new in envelope. See images for precise mainspring specifications. The D on the end was added later do people knew it was a DB&H end without looking at the back of the envelope. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.