Welcome JoeDrum22,
Looks like a Type I Transitional Stamp but without the vertical hatching
[img]http://black.net.nz/avedis/images/trans-1-shifts.jpg[/img]
from: http://black.net.nz/avedis/trans4.html#trans1
Some don't show the vertical hatching, and it meets the my other diagnostic criteria. Late 40s (1946-1949) according to Bill Hartrick.
Expected value $127 with half selling for between $79 and $150 n=17 based on my pricing research:
http://black.net.nz/avedis/avedis-prices.html#15
Cleaning it may reduce the value. The rivet hole pattern and rivets themselves look like they were added after the cymbal left the Zildjian factory. I don't have strong pricing evidence on whether or not rivets affect the price of a cymbal, but we're talking $10-$20 in expected price and that small an amount is hard to estimate accurately given all the other factors influencing prices. You should weigh the cymbal as this provides a bit more information. Reporting the weight in grams is customary, but ounces (or pounds and ounces) is fine. Back in the late 1940s that could have been a ride cymbal.