10 Gr. drawing numbers with handwritten cancellation "lindens 26. 9. 72" being a correctly franked single franking on large part one insured letter front (on complete letter contents fixed) with framed cancel of 3 lines Hanover lindens 26. 9. 72 to Düsseldorf with forward note to Strassburg, stamps and front in perfect condition, Corresponding photo expertize Sommer BPP, single frankings of this stamp are very rare, catalogue value for a complete cover was 5000,!