At 5 inch height, yours is definitely a "Large" version! It is larger than the one shown in Richard's site under his "Jumbo Large" category.
I think Richard's site information with his own thoughts about sizes and numbers is about as good as it gets.
But consider that, before yours was faceted, it would probably have been almost 6 inch height, and if sold as unfaceted, perhaps worthy of a "Richard category" of its own ("Mammoth", for example).
Richard has said that he considers the DSF43 weights to have been "only a small issue each year"... and from around "1970 to 1978". If there were only 1 per month for 9 years, that would be 108 examples. If 10 per month then 1,080. But it does seem that few have so far come to light in the collector market.