That Crusaders album last night was really special, one of the best recordings I’ve listened to in a while. Chain Reaction is one of their best records and this copy was amazing.
It appears to be a MFSL test pressing. It’s in a plain white sleeve with a stamp at the top that says "Sample Record Not For Sale" and "Record No. MFSL-1-010A/B Sample No. 5". I can’t find anything like it on Discogs. I have a VG+ standard MFSL pressing also and this sounds much more dynamic than I remember that one sounding and the vinyl is NM.
The best part is I got it at my local record store for $10.98.