I've got a 70's era Slingerland snare that has a Festival steel shell with a Zoomatic strainer and butt plate. I thought the Festival came with the cheaper Rapid strainer. There aren't any extra holes from a previous Rapid strainer or plate so it seems to have come from the factory with the Zoomatic.
Was this an option from Slingerland? Any idea what this beasty is?
Thanks,
Mark