GB Security Machin Stamps - U2923. Cylinder Block of Six Stamps. SECURITY BACKING PAPER. M18L. W1 (Gravure, Walsall). 10p. Date of Issue: July/August 2018. See image. MINT Never Hinged MNH.

SECOND PRINTING - July/August 2018 - Blue Phosphor & Yellow Fluorescence in iridescent ink..

If you purchase more than one item at the same time, request an invoice / total and I will combine postage where possible, depending on weight (if multiple postage already paid, I will issue a refund). For individual stamps, booklets, booklet stamps, cylinder blocks and booklet panes I only charge postage for one item.