Welcome to the thread Schubert.
Back in the 70's I worked for a big dealer who had every known MM cart known to man in stock.Thousands of them. The only thing that could beat an Acutex was probably the best MM cart ever made ,the Empire EDR-9 .
Sounds like a real cool job to have. In the mid 70's I was in the middle of puberty working as a busboy scraping for money. If I worked for your audio dealer guy I may have been tempted to stuff some cartridges down my pants pockets (making sure stylus guard was on of course). I'm sure some on the MM thread would challenge your Acutex claim; especially Raul once he returns from his "sabbatical". Don't expect a challenge from him here however. From personal emails he never figured out the ET2.
A 420 cost him about 40 bucks as I recall. But he bought hundreds at a time.
Was he Italian by chance ? Lets assume "hundreds" is 300.
$40 x 300 = $12,000
$520 x 300 = $156,000
I paid $70 Cdn. for mine back in 2012 incl. shipping. I remember it vividly because it was advertised as a Puntina. Very close to Putana that I am familiar with so it made me laugh. There is that brothel theme again. The first time I heard the 420 I also laughed, then some singing and dancing. Maybe some of that later today also. Happy and safe New Year to everyone and its already Jan 1 in NZ as I post this and just after midnight as I hit submit here, Downunder. Cool