Brief history of New Beats including the ink styles:
http://black.net.nz/avedis/new-beats.html#NBtop
Yours have first generation ink as expected given the 60s trademark die stamp. It would help me to know whether the height of that stamp is closer to 1 3/16" or 1 1/4" or 1 1/2".
That page has weight ratios and plots for 14" (the most common size) but since that was written I've got enough 15" data to do those also. I haven't got time to do the pretty pictures by different production eras, but the ratio for 15" is 68% (top to bottom weight) and varies from 60% to 77%. That's based on a sample of 27 pairs. If you can get the weights for yours I'll add them in to my database. Average weights are: 1036g for the top and 1522g for the bottom, but as we know from the 14" data there is lots of individual variation plus changes in weights over the production eras.
The 15" results are similar to the 14" size which have a ratio of 71%, and varies from 57% to 86%. The 14" data is currently based on 97 pairs.
I also have expected prices for these, but again haven't had time to do the analysis and publish the results. I've been swamped with "real world" work for some time now. But as always, all my raw data is free to anybody who wants it. It comes in spreadsheet form. You don't have to take my word for anything or wait for me to get to a new analysis. Just ask for the raw data.
The only thing I haven't got data on is the degree of taper near the edge. I bought myself a relatively expensive deep throat micrometer/thickness gauge so I could start documenting cymbal thickness at the bell, at a few points on the bow, and at the edge. But when it arrived it didn't work. I got my money back but I haven't begun the process of finding a replacement. The whole experience sort of put me off. So I can't say about extra thin edges being due to taper being added after yours left the factory. What I can say is that adding extra taper would be done with lathing, so if yours don't show a difference between the lathing on the outer edge and the lathing elsewhere on the bow then they are probably factory. But that probability might change with knowing the weights, and having good pictures of the lathing top and bottom. I don't see anything suggestive of re-lathing in that profile picture, but it isn't really the right angle for picking up lathing variability.