Bob, I do believe you are correct on the date and model number (if you have a 9cm boiler)
I just measured it and it is 9cm. I saw it dated in the Dampfspielzeug book on page 63, it didn't show the model number but a good picture that's a match and the date of 1907. The book is in German so I didn't translate the text.
Thanks for you help, Nick