No. 136 "Short Window" piston-filler, black hard rubber endpiece (marked 136 / OBB), black celluloid cap, gold-plated cap ring and "tie" clip, flat top, inset white captop star. 127mm. Two-tone 4810 Montblanc circle-vent nib, presumed broad oblique but appears medium, slight flex. Excellent condition, clean, glossy and unblemished.
-Wallrafen, Stefan & Jens Rösler. Collectible Stars I: Montblanc 1908-1947. [Cologne: 2014], pp. 104-105. Scarcity rating of 7 (on 12-point scale).