On the back in pencil – Eleanor H.
The stamp from the photo developer says – Webco Print, Nov 19 1930, Made in San Jose.
Taking into account the time it took to finish the film and for the processing of the photos, I’d say this image was taken on or around the 31st of October.
I paid US$9.95 for this photo. The second one which was listed from the same series went for over US$100.
Mugshots and Miscellaneous 
This is an awesome picture! And your Minnie has a hat, and Mickey has buttons ;-D! You certainly got a great deal comparing to the other buyer! Thanks for sharing :-).
I love how many of our collecting interests are the same Linda! It is so much fun. Will post another costume photo soon. Best wish to you!!