I thought it was a blue badge Zim-gar at first glance.Have not seen yours before,but its a beauty.
My COS Star snare as that badge.
As for heads, I highly suggest going to your local GC, or whatever you have for a drum shop, preferably a mom-n-pop, but whatever you have. The reason I say the Z-100 is because it is less $$ than the Amb, the coating is much stouter and Roy Burns has made these heads specifically to meet the needs of 3 ply shells of the era, no matter the maker. I spent about 20 minutes on the phone with him. I sent an email to them extolling my appreciation for a good, high quality, new head design. He assured me the new coating is more indestructible than the Amb ever will be, in other words, NO CHIPPING. I have bought several NEW Amb and the within a week, the coating has flaked. I hate tat, spend 15 bucks on a head and within a week the coating is flaking. And they will not replace them, so you out 30 bucks. Try one on a snare, tey are usually around 10 bucks to boot! Make no mistake, they are great heads, and if you do any brush work, you'll really like this coating. They are the same thickness, 10 mil, but they are more "supple" right out of the box, they don't stretch as bad as the Amb does, so you won't have to "seat" the head and then play for an hour and then re-tune.