Alas I haven't yet put up my annotated hammering pages so I can't point you to some new part of my site. Yours has a look which makes me think that it might be a hand hammered one from the late Trans Stamp/Early Large Stamp period. But it's not a sure thing. It could be a cymbal from a later production period. The evidence isn't strong either way. But here's what I'm noticing.
[img]http://black.net.nz/avedis/images/A-Zildjian-1.jpg[/img]
[img]http://black.net.nz/avedis/images/A-Zildjian-3.jpg[/img]
The linear looking pattern to the hammering (we type it as ///// or ||||| or \\\\\\ as a quick way of describing it) is often found on cymbals from the mid 1950s. But that's just a statistical observation not a "if it has this then it is 100% definitely a..." kind of observation. And the contrary evidence on yours being a 1954 comes from the lack of obvious hammering on the bottom. So I can't be sure.
At present Drumaholic is the only person I know of who claims to be able to identify a 1954 stamp from the stamp alone:
http://www.vintagedrumforum.com/showthread.php?t=16096
But he hasn't revealed how to identify a 1954 stamp from the stamp alone. I tend to rely more heavily on the look of the hammering, because that's what tells you the production period for a cymbal. The pressed in die stamp goes on much later in the process (when it is retrieved from the vault to fill an order) which is consistent with what we've observed about the proportion of mismatches between the die stamp on a cymbal and other production clues.
Since that part of my web site was last updated I've changed my thinking after coming across more evidence. I've got a couple of cymbals with the quirks and that 1.25" stamp but found on cymbals which fit the 1960s production clues. And I'm starting to think that particular configuration represents on of the dies used during the 1960s. We already know there were multiple dies used during the 60s, and up until now there were thought to be two. Now I think there are at least 3. An alternative explanation is that the quirks themselves represent a particular kind of stamping fault, but based on what I've seen to date I'm thinking that the quirks are the telltale evidence of one particular die. But it's early days on that one.
Also, on present evidence I can't rule out the possibility that the so called 1954 stamp cymbals represent cymbals which were hammered and lathed in the late Trans Stamp or Large Stamp era, sat in the vault for some years, and then got a die stamp pressed in which is one of the 3 die stamps used in the 1960s. That's a long time in the vault, but it would also explain why they seem to be relatively rare. Of course the other explanation for their being rare is the number of people who just say "that's a 60s stamp" and don't look any deeper.
If Drumaholic were to come forward with a proper definition and example of how to tell a 1954 stamp from the stamp alone, then we could swing into action and check through our cymbals and do the correlations with other production clues. But he won't, so the community doesn't get the advantage of independent eyes checking the evidence and interpretation.
Here's an older thread where Drumaholic ids a 1954 stamp and you can see the degree of hammering on it:
http://www.vintagedrumforum.com/showthread.php?t=9172&highlight=1954
Yours doesn't show that much hammering, but given the degree of variability...it still could be.
One other check you can try is to measure the diameter of the mounting hole. If it is 7/16" (slightly smaller than the modern 1/2" standard) that adds weight to it being older. If it is 1/2" that tells you nothing about whether it is 60s vs mid 50s, unless you can also detect that it was enlarged. My writeup on this is here:
http://black.net.nz/avedis/holes.html
But be warned that Drumaholic himself has in the past stated that hole size is useless:
http://www.vintagedrumforum.com/showthread.php?t=43808
see also:
http://www.vintagedrumforum.com/showthread.php?t=34455
I just don't happen to believe him since I've been having a look (helped by a few others) and have found useful information. It just takes more finesse to interpret it.