In general. Inverted precancels are very common. I have thousands of them myself. They do not usually command any premium value, other than just being another variety to collect.
Check out the sub-section "Describing Precancel Imprints" at this link for more information:
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Stamp Community assumes no liability for errors. Copyright 2005 - 2026 Stamp Community Family - All rights reserved worldwide. Use of any images or content on this website without prior written permission of Stamp Community or the original lender is strictly prohibited. Privacy Policy / Terms of UseAdvertise Here