Hi, Mark,
When you said Webley Eagle did you mean Falcon, made from '62 to '71? Have both myself, reckon the Webley is better made. Think the Meteor was cheaper, hence them selling in millions. Haven't seen a Falcon in .177. The Thrale book says they are scarce compared to the .22.
Regarding the opens on the Meteor, I've got a (stalled) resto on one of a similar age ('69-73, if the SN is TE), but the sights are fine. I'll be keeping the opens when I get round to the rebuild, but sure I've seen them advertised, or ones that'll fit.
ATB
Bruce
Webley Mk3 x2, Falcon & Junior rifles, HW35x2, AirSporter x2, Gold Star, Meteors x2, Diana 25. SMK B19, Webley Senior, Premier, Hurricane x 2, Tempest, Dan Wesson 8", Crosman 3576, Legends PO8.