When looking at either the datasheet or a physical example of the AWSCR-CV Series resonators from Abracon, there is no Pin 1 indication.
This is because both pins 1 and 3 can be used either as input or output, so the functional pin assignment can be read as follows:
1:INPUT/output
2:GROUND
3:OUTPUT/Input
Applicable part numbers
AWSCR-10.00CV-T
AWSCR-11.00CV-T
AWSCR-12.00CV-T
AWSCR-14.75CV-T
AWSCR-16.00CV-T
AWSCR-16.93CV-T
AWSCR-18.43CV-T
AWSCR-20.00CV-T
AWSCR-24.00CV-T
AWSCR-25.00CV-T
AWSCR-27.00CV-T
AWSCR-30.00CV-T
AWSCR-32.00CV-T
AWSCR-40.00CV-T
AWSCR-48.00CV-T
AWSCR-50.00CV-T
AWSCR-8.00CV-T
535-10005-2-ND,535-10005-1-ND,535-10005-6-ND
535-10006-2-ND,535-10006-1-ND,535-10006-6-ND
535-10007-2-ND,535-10007-1-ND,535-10007-6-ND
535-14319-2-ND,535-14319-1-ND,535-14319-6-ND
535-10008-2-ND,535-10008-1-ND,535-10008-6-ND
535-10009-2-ND,535-10009-1-ND,535-10009-6-ND
535-10010-2-ND,535-10010-1-ND,535-10010-6-ND
535-10011-2-ND,535-10011-1-ND,535-10011-6-ND
535-10012-2-ND,535-10012-1-ND,535-10012-6-ND
535-10013-2-ND,535-10013-1-ND,535-10013-6-ND
535-10014-2-ND,535-10014-1-ND,535-10014-6-ND
535-10015-2-ND,535-10015-1-ND,535-10015-6-ND
535-10016-2-ND,535-10016-1-ND,535-10016-6-ND
535-10017-2-ND,535-10017-1-ND,535-10017-6-ND
535-10018-2-ND,535-10018-1-ND,535-10018-6-ND
535-10019-2-ND,535-10019-1-ND,535-10019-6-ND
535-10004-2-ND,535-10004-1-ND,535-10004-6-ND