Reading some older texts recently, I came across
L.-- s.-- d.-- q.
which were obviously Old Money accounting abbreviations. For whatever reason, I had never seen q. before, or had not remembered that I had.
The matter of L.s.d. has been questioned and answered here, so I will not bother with that now. I did not find it simple to confirm that q. stood for farthings as the abbreviation does not seem to have ever been common, and certainly would have little use now.
I had help from
making things clear what q. probably meant. Searching farthing produced quadrans. and the q. became obvious. The Greek form of quadrans is rendered farthing in the KJV.
I have only found appearances of q. in 18th Century works, and only involving currency exchange.
My question is when did q become an abbreviation for farthing and was it ever a common abbreviation. I've reached the end of trails on this. I hope someone else can help.