Last pair I saw was about $130.

Sound Formulas were the precursor to the Signature line. People who sell them at low prices don't really know what they're selling and are ignorant as to their true value. Since yours are medium-heavy hi hats, then they're hi hats that are extremely versatile and can be used in just about any situation, giving them their higher value. I'd say yours can be valued at between $200-300, especially since they're discontinued. I once bought a used sound formula 19" crash at a pawn shop for $190 CAN., and that's because i haggled the price. Had a regular drum shop been selling it used, they could have easily sold it for $190-250. Consider it's current equivalent as well, and that can help determine your value. The current equivalent would be a Signature medium set of hi hats. Here in Canada, they're currently selling at $630.00.

I just found a set of used Paiste 1st generation Alpha medium hi hats at a pawn shop, that i'll be picking up for $80.00 that were Swiss made, as opposed to their 2nd generation counterparts, which were made in Germany. This 1st generation's lathing is very similar to the Signature and Signature Precision, and can could be argued that the Precision version is based on that 1st generation. Hope this helps !

cheers,

Rob

I got stupid lucky to pick up a 90’s Pearl kit for $500 that came with a full set of signatures as well as a 16 sound formula crash. The drums are long gone but the cymbals are here to stay. The sound formula is fantastic, every bit the quality of the signatures.

Thanks to all for the input. It's greatly appreciated!