It is the buyers responsibility to examine all items to determine if an item is safe for use - the buyer accepts all responsibility for use of items purchased
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Regina America freewheels are top quality. The Regina America body is very high quality. It is pretty much similar to the CX system (uses the same cogs) but the bodies are snazzier and have a seal that in theory helps repell dirt. This is a wide space freewheel designed for roughly 126mm rear spaced hubs/frames. You can use a wide space chain to get that nice positive ker-chunk sound when you shift. Or you can use a narrower space chain (one for narrow 6-8 speed) for quieter and quicker shifting (but you loose some of the ker-chunk feeling that some folks like).
The ratio is 13-21. Cogs are 13,14,15,16,18,21. The threads are ISO which means it's a Class A (perfect fit) on either BSC or true Italian threaded hubs. It also is a perfect fit, of course, on a true ISO threaded hub.
We have a few of these - the photos are representative of the quality you will receive. Note that like all older production freewheels, YOU MUST drip some oil into the body. We like Phil Tenacious oil. DO NOT use grease, the freewheel was oiled at the factory (and not greased).