[Arran]

I think that the one pictured is a synchronous type since it has six pins instead of three or four. This probably won't be an issue since you could omit the second set of contacts. However it likely has the same problems that most NOS vibrators do, if you don't know how it was stored it may have oxidation on the contacts. I would guess that these vibrators on fleabay are some sort of military surplus. The only question is whether someone broiled the vibrator transformer by plugging the radio into a 120 volt mains?
Regards
Arran