As promised, I emailed Krystaly and after a bit of to-ing and fro-ing getting some specs other than the frequency back to him (freq tolerance, stability, operating temp range, load type and capacitance), I placed the order costing me 12 euros for the crystal and 8 euros shipping (£17 total at the time) on the 4th August.
I received shipping notification on the 21st September and 7 days later, the 19.880 crystal arrived this morning safely packed in a bag, bubble bag, a A6 postal box and jiffy envelope.
I have tested it quickly by swapping the Lo band crystal (well mid band/FCC/Cept) in my Concorde 2. VCO didn't need adjusting, it appears to transmit and receive on frequency across to my FT857d. When I get my work space back, I'll put the Concorde 2 on a frequency counter and also check the output power is similar to the other bands.
My goal is to remove the Hi band (27.865 - 28.305), shift the other 2 crystals up and put the new 19.880 into the Lo band socket, alter the wiring on the switch so 41-80 display moves with the relevant crystal (now Hi position) and utilise the Hi LED for the new Lo band (-40)
I have a poorly Concorde 3 which has had a bigger band switch and expander board added and wires/traces cut. I have a suitable switch from a scrap (a sad word) Concorde 1. When I get the time, I'll try and get it back to how it first was and order the missing crystals from Krystaly.
Whilst I was initially waiting for Krystaly to get back to me, I approached someone else who quoted me £108 for pne crystal, so I definitely think Krystaly will be my first choice.