Would you pay $650 for a regular M19?
Cause actually that's what they are.
These may be marked as 38 Special, but they actually chamber and shoot .357 cartridges.
Had a couple in my collection and was very disappointed to find out they are not chambered in 38 Special as they are marked.
I like unusual models/chambering, these didn't actually fit the bill for my collection, traded one away and sold the other some time back.
There are other models that were chambered in unusual flavors, as an example M66, M68, M681, M581 (supposedly, never seen or heard of one in private hands), M586 and M686's in 38 Special, now those are special.
I believe, and it's been surmised here, that these were marked this way as they were intended for export to fulfill Mexico/South American orders where the Magnum loads are illegal.
Not sure if these will ever command "collectible" prices, but who knows - shrug.