Inverted P appears on any frame type (EM, Pro, Corsa, Criterium, Corsa Extra), the connection between P and SLX is incorrect.
P (inverted) appears in the range ~E7700 - ~A0600 (i.e. end of 1983-1986). P (normal
appears in the range ~D4000 - ~H1000 (i.e. end of 1992-1998).
SLX in EMC appears unannounced, stickers, labels (already in summer 1984) - if you have an EMC frame from the range Z0001 - Z4250 with a "narrow" geo (no seatstay cap) and a Silva brake bridge "flat bottom" and "straight" Eddy Merckx inscription... you can have a pleasant surprise (funny, there are also those with "normal" elements - not much, but they are); such a construction ("normal" geo + brake bridge "cube" Gipiemme) is the norm for 1 Pro 753 series, which appeared at the same time.
Then the name "Pro SLX" appears.
Only from ~Z4000 does the X mark appear (to be weirder - not in all copies)
The name "Corsa Extra" (including the sticker) is only ~Z7500.
Stickers are a separate galaxy in EMC (maybe one day I'll describe it - hard work
Determining the year of production (sometimes more precisely) is a detective work... Example: team frames built in November 1992 - D50xx/D5200 and Lotto Caloi frames built in November 1993 - D96xx/D97xx. Average output ~380 frames per month: you can - roughly (the output during the year was variable) - determine when the frame from this range was created (so there is invaluable data on frames for teams). The game starts when this data is not available...
Translated with
www.DeepL.com/Translator