I'm no postal stationery expert, but I would say that it is highly unlikely to next to impossible that your example is a U124. If you refer to the Scott Catalog, the numbering has a (+) prefix. Included in the introductory notes is comment that "Some authorities claim that Scott ... U124 ...(with plus sign + before number) were not regularly issued and are not known to have been used."
Expertization would be the only way to know for sure and with that reference, I suspect that few would even venture to expertise such an unlikely used specimen.
Trusting notes on the back is usually a quick way to get into trouble. Several different numbering systems have been used over the years. Then add in the usual tendency to stop with either .the first or the most expensive variety. Greed and lazyness make for a lot of errors in identifying stamps of all kinds.
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