At least the best fit I could find was a U-296. Anyone ever see this type of embossing? I thought it could be LOCKE with an L missing, but the R in 'OCRE' is made deliberately to be an R, not a C. I don't receive the digest, so please email me directly if you have any info. Thanks!
"Definitely a badly stamped LOCRE error stamp." Thanks to David Dahle and Jim Colburn!