Vase "Eiszapfen" (Icicles) - Loetz (early production) or Harrach

This is my new addition to Loetz's early production (at least I think it should be Loetz). The vase measures 10.5 x 13.5 cm and was probably made around 1880. The vase is similar to the PPN 882 vase (order by Ignatz Lösel, Böhm. Kamnitz) - see the last photo. A small vase of this type in the design - azure glass is displayed in PASK Klatovy. Some sources attribute the production to the Harrach glassworks, others to the Boston & Sandwich glassworks (however, the Museum B&S allegedly ruled out this possibility). Glass with "Eiszapfen" (Icicles) reappears in the production of the Loetz glassworks in the 1920s (or 1930s) - see my vase: https://www.bohemianglass.org/katalog/vaza-nid-34-eiszapfen-4098/detail/.
--- February 26 update:
Despite the similarity with Loetz PPN 882, there are two options with respect to Harrach books: Loetz or Harrach.