Interesting Randy-here is a 1926 Price List that shows the 'H' hammer gun. Prior to that time they were 'F' for Royal Steel and 'FF' for 'Good Damascus'
Unfortunately, there is no good source for LC parts although here are some options:
Keep an eye on e-bay- there are parts listed right now but you have to know exactly what it is that you need. And even if you find a replacement buttstock, it will still require some hand fitting. Hope things work out for you.