So do I as well as some from the teens and 1920's and I would agree that they certainly look over-developed. Actually, they look almost exactly like my own hand-made film when it is over-developed which is one reason I believe the technology (or lack thereof) behind them is basically the same. The film I make now and especially the negatives I have from the 20's look very, very similar in most respects and that's where this whole question really started.I have a few negatives from around that period, and they look today to be both over-exposed and over-developed.
Also, FWIW, there is an unopened box of 120 Super-XX of 1948 vintage listed on eBay right now. The seller has good,clear photos of the box and no speed is shown on the box at all. If the seller's asking prices weren't quite so high I would consider buying a few boxes to investigate.
Googling Super-XX, I have seen ASA speeds given from 64 to 200. I could go along with 64 but IDK about 200. Again though, maybe in 1947 they were still intentionally overexposing and the Sunny 16 rule doesn't quite apply. I'm not really sure this model of the Tourist (with the anaston lens) was considered a mass snapshot camera.