Labourer 7 kopeke red brown in block of 4 with variety partly imperforated due to preprinting paperfold, fine/very fine

Labourers 10 kopeke dark grey with variety imperforate at right, very fine mounted mint, 15 kopeke grey green with variety imperforate at left, fine/very fine unmounted mint (light crease) and 30 kopeke blue with variety imperforate at left, very fine unmounted mint, cat.v. 320

collection of the Mauritania UPU archive between Michel 693 and 813 all affixed to parts of the archive sheets and each in strip of 3 ex. all cancelled with the 3-line Specimen/ Collection/ Mauritanie including several sets imperforated, nicely described on album leaves, totally 141 ex. 

including Civil War and poster stamps on 3 stock pages

better ex. on stock page