Comsco Mainspring #1010F for 12s Waltham Colonial A Factory No. 2234 - Steel

Comsco Mainspring #1010F for Waltham 12 Colonial A Model movement, Factory No. 2234, new in envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate good job of representing the item.