Seals Used in Poonch : There were two intaglio seals in existence in Poonch , one that has been called as the "Poonch Seal" with four lines of Dogri inscription reading "Shri Raghnath ji sahai mohr dak khana riyasat Punch Samvat 1933" and the second called the "Kahuta Seal" and reading "Shri Raghnath ji sahai mohr dak khana riyasat Punch 39" .
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Literature
Stamps of Poonch - Douie, Philatelic Journal Of India 1932
Poonch: The Postal History by A.S.Bard
Valuation
Looking at Stanley Gibbons catalogue, the more rare of the tete-beche varieties are valued at multiples of 100-1000 times the ordinary stamp (e.g. the semi tete-beche variety of SG12, SG52 are all catalogued at a multiple of 1000). Note that this tete-beche is not rare but unique! In addition what multiple would you estimate for the stamps being on cover (in very fine condition) in combination usage with a British India postal stationary?