Are we talking about technique/design? ... Or are we talking about collectability???
These fish were made by master glassblowers from Murano, trained in the Murano technique.
My reply is as follows:
yes, this is Murano
made by Marcolin / FM Ronneby, Sweden.
The fish, B-15, were made in the 1960's, in different sizes: 30, 25, 20 and 13 cm
early 1970's they were available only in 22 cm