Yes as far as I know the Pyramid with Italy predates just the Pyramid, but I have no real evidence for that yet. I'll be writing to UFiP once I have the bare bones of a timeline up on my web site so they can have a look and comment. I don't want to pester them with 47 one at a time questions just yet.
I've got 2 rides from back then and they both show clear hammering with a smaller hammer face:
[img]http://black.net.nz/cym2014/ufip-ride-1.jpg[/img]
I'm interested to see yours lack that, and they also have a gently sloping bell. That may be because they are hats. I've seen a few hats from the early period. Here is another pyramid and made in italy hat:
[img]http://black.net.nz/cym2014/ufip-pyramid-hat.jpg[/img]
and yes, it doesn't have a steep sided bell -- but it does have those extra hammer marks. I note that often in the history of Italian Cymbal Companies there is mention of two lines: a more hand hammered one, and a simpler less hammered one. Maybe that's what we are seeing here. But I didn't know this distinction went back that far. I'm still just learning about things.
I also have a 20" ride from the next period (pyramid but no made in italy) and it looks more like yours in terms of bell shape. And it has no over hammering in that sharper hammer face style.
[img]http://black.net.nz/cym2014/UFiP1s.jpg[/img]
[img]http://black.net.nz/cym2014/UFiP3s.jpg[/img]
Other things:
Yes B20, but these predate rotocasting (as far as I can tell). They go back to when casting was done in vertical molds, called "the gravity method". Before 1975 UFiP were not using rotocasting, although the year has been hard to pin down. Luca Luciano says 1975 in his book Italian Vintage drums and cymbals, Agenda Publishing 2012, p130. In contrast, Hugo Pinksterboer in The Cymbal Book, p200, says
c 1978: after 14 years of experimentation, the Italian Zanchi brothers start using the Rotocast system, which will also be applied by UFIP
So it may be that rotocasting was in experimental use since 1964 but only went into full production a decade later or so. Luciano gives the date of filing for the patent as 1977 (p 130). Then there is also the subtle relationship between Zanchi and the UFiP collective which means that the rotocasting machines were available to UFIP without having the buy the rights, and in fact the machines may have been located in the UFIP factory during some or all of the R and D phase. My main concern is that these days sellers on eBay seem to automatically assume Pyramid stamp UFIP = rotocast when in fact the older ones are Gravity Cast. Does it really matter? Only if you are trying (as I am) to put together a proper timeline.
Do not overheat the metal when you work on them. Go slow and stop often. The chunk out of the edge is best done with just emory cloth. No power tools needed. And you can lose a chunk like that and it will have no discernible effect on the sound.
Does the other crack run along the lathe lines, or is it also on the edge?
Do not just cut down the 15" hats to 14" hats and expect them to be nice. You usually need to adjust the tension and the taper accordingly.
Oh, and I presume you know UFiP cymbals are metric? Since they are metric they will be more likely 380mm which is very close but not exactly 15". Just a tad under. The difference is more detectable on some sizes like 14" and 20".