Basic watch parts reference.....
#180 barrel and arbor
#180/1 including mainspring [complete]
#181 barrel, drilled core
#195 barrel arbor
#197 core and ratchet wheel
#201 centre wheel
#203 intermediate with pinion
#210 third wheel
#220 fourth wheel
#240 cannon pinion
#250 hour wheel
#260 minute wheel
#275 sweep seconds pinion
#407 clutch [castle] wheel
#410 winding pinion
#415 ratchet wheel
#420 crown wheel
#425 click
#430 click spring
#435 yoke [return bar]
#443 setting lever
#445 setting lever spring
#705 escape wheel
#710 pallets
#721/22 balance