This should answer your question:
Quote:
According to page 1074 of the book "California Town Cancels 1849-1935, Volume II, authored by John H. Williams":
"This roller cancelling device was purchased in Germany by Postmaster James B. Rickard. Its use was authorized
9 November 1929 and was used until recalled by the POD 20 Jan 1948".
I hope that clears this up for you. Additionally that is California type SBA-1750 if you are keeping records.
It was previously discussed here:
https://goscf.com/t/36901So the bottom line is yes, it is unusual looking, but no, it's not particularly rare, as it was in use for more than 19 years.