I purchased a book called "The Open Fountain" and it's published by Pickering & Inglis. It even says it's part of The Royal Banner Series. However, the actual book is not the same as what you have above. Instead, it's the exact same book as "Real Riches". The full title page says "The Open Fountain; Interesting incidents for young and old clearly setting forth the glad tidings of 'so great salvation'; Profusely illustrated".

If you're interested in it, I'd be happy to send it to you, free of charge. It didn't cost me much, and as you're trying to build an archive, I figured it might help. It's been "library rebound", but it was awarded to Dora Radcliffe for Attendance at the Main Street Gospel Hall Sunday School by her teacher, Alice E Hull, back in 1927.