Rud Ibach Sohn Berlin 7084 (nr 77210)

[Zina]

Hello!
I got grand piano named Rud Ibach Sohn Berlin 7084 (nr 77210). And i know a little bit about its history. Unfortunately, i don't know the year when it was made. I will be really grateful if you are able to find year when it was made (maybe not exact year). Thank You!!!!!!

[Bill Kibby]

The number suggests that it was made in 1915.