Counters on the rail were a lousy idea at the beginning and they remain a horrible thing to do to a table. I've got the scars on my right index finger to prove it. They were not made well to start with -- remember that Brunswick at the time of the Gold Crown design was not run by anyone interested in pool -- and they cheapened the over-all quality of the table. If you are playing a short race, coins are fine and in fact better than a score wheel which might accidentally move. A longer match (14.1) requires beads. In Europe it is common to have a scoring device on the wall.
Bob you know, in the pool rooms of today, the room owners would not spend the dollars to install wall mounted counters, and if so, they would get torn apart from the lack of whatever + alcohol. The one thing I truly liked about he GC I and GC II counters, the notches for each click were define and these earlier counters did not spin and loosen up quickly like the next generation, over seas made counters on the GC III etc. I truly hated the wrap around metal trim on the top rails as it always ground in that grey metal ''in'' to you clothes and if you propped your cue along the rail and it slid and hit the pocket iron trim it would cut into your shaft.
One more comment on the metal trim, Little Al Romero was a perfect example of this as he was short and ''always'' wore collared short sleeve shirts with his shirt tails hanging out. He not only wore the gun metal grey into his shirts, his shirt tails always had horizontal wear holes from practicing so much. I don't know of many players that practiced as much as that man in his day.