Here you go, I found a directory listing for a photographer Robert Butler at 4517 Frankford Ave in Philly - 1924:
http://interactive.ancestry.com/2469/2726577?pid=159975062&a...In 1921-1923, there was a different photographer at that address (and before that it was a Jewelry store) so Butler Studios at that location only came into existence around 1924, so the photo must have been taken in or after that year.
I looked through some of the later years - Robert Butler was still there in 1925. The directory records for Philly then jump to 1930 and unfortunate the scans were poorly done so it's hard to make out but there is a photography studio at the same address and it looks like it's in the B's - so probably Butler Studio. The fact that he was now calling it Butler Studio instead of just going by Robert Butler might be an indication that the photo was taken closer to 1930. The next directory is 1935 but unfortunately it's incomplete and doesn't include photographers (the business directory ends at L so it doesn't reach P for photographers). So it's probably safe to say Robert Butler/Butler Studio was operating from 1924 until at least 1930.