Marked C-3H HM It matches up to a S65 unit from one of my friends collections. Headlight diameter measured outside is 4 1/4 On top it has its red indicator light, but is missing its neutral plastic indicator light cover. Also It is missing the two tabs that mount to the frame they are broken off. I believe it could still be mounted. I have included measurement specs, so please compare and make sure it is a fit for yours.