Hi Jerry, What pretty irises! I'm afraid it would be very hard to identify the cultivar. Are you thinking that the owners from the 1950s planted them? There are a number of blue reticulated iris cultivars that were around back then. Here are some from the garden.org Plant Database:
Harmony: introduced in the 1950s and is a very common cultivar:
Joyce: introduced in 1943
Spring Time: introduced in 1950
You can also find some information on Iris reticulata and hybrids and some cultivars at the Iris Encyclopedia website:
https://wiki.irises.org/Spec/S...
Hope this helps!
