On watch certificates that are shipped with Non-United States Rolexes, there is a punched number in front of the serial number that signifies the country with which the watch was initially shipped by Rolex Geneva.
These numbers come in handy when considering a grey-market watch to discern its where the watch was initially releas.
Here is a list about country codes :
010 - Switzerland
012 - Switzerland
013 - Switzerland
014 - Switzerland
015 - Switzerland
017 - Switzerland
021 - Switzerland
022 - Switzerland
023 - Switzerland
024 - Switzerland
025 - Switzerland
026 - Switzerland
028 - Switzerland
032 - Switzerland
033 - Switzerland
036 - Liechtenstein
037 - Switzerland
039 - Switzerland
044 - Switzerland
045 - Switzerland
061 - Switzerland
062 - Switzerland
100 - Germany
110 - France
112 - France
113 - France
119 - France (COMEX)
120 - Austria
121 - Austria
122 - Austria
123 - Austria
124 - Austria
125 - Austria
126 - Austria
127 - Austria
128 - Austria
130 - Belgium/Luxemburg
133 - Netherlands
134 - Netherlands
135 - Netherlands
136 - Netherlands
137 - Netherlands
138 - Netherlands
150 - Spain
160 - Great Britain/Ireland
170 - Italy
181 - Italy
200 - Greece
204 - Italy
201 - Malta
202 - Turkey
205 - Cyprus
207 - Corfu
208 - Greece
210 - Portugal
212 - Portugal
213 - Portugal
215 - Portugal
216 - Portugal
217 - Portugal
218 - Portugal
226 - Denmark
228 - Denmark
231 - Denmark
233 - Denmark
235 - Denmark
237 - Iceland
241 - Norway
242 - Norway
246 - Norway
253 - Norway
262 - Sweden
265 - Sweden
267 - Sweden
268 - Sweden
270 - Sweden
271 - Sweden
272 - Sweden
273 - Sweden
283 - Finland
284 - Norway
286 - Finland
291 - Finland
298 - Finland
311 - poland
312 - Poland
317 - Bulgaria
318 - Slovakia
320 - Czech Republic
321 - Czech Republic
322 - Hungary
323 - Slovenia
325 - Serbia Montenegro
330 - Russia
381 - Turkey
400 - Hong Kong
402 - Guam
408 - Seoul
410 - Japan
413 - Korea
430 - Singapore/Brunai/Indonesia
431 - Malaysia/Thailand
440 - Taiwan
500 - India
501 - India
507 - India
505 - Pakistan
513 - Kathmandu
514 - Bangladesh
526 - Bahrain
527 - Middle East
529 - Saudi Arabia
531 - Saudi Arabia
532 - Saudi Arabia
533 - Kuwait
535 - Katar
536 - Abu Dhabi
537 - Dubai
538 - Oman
539 - Oman
542 - Iran
548 - Israel
551 - Yemen
573 - India
605 - Tunisia
612 - Egypt
634 - Congo
668 - Kenya
680 - South Afrika
700 - Canada
710 - USA
720 - Mexico
722 - Mexico
733 - Honduras
737 - Costa Rica
741 - Bahamas
742 - Bermuda
752 - Jamaica
756 - Dominican Republic
757 - Caribbean Islands
758 - Virgin Islands
759 - Turks Islands
760 - Barbados
761 - Netherlands antille/aruba
762 - Aruba
764 - Guadeloupe
765 - Antigua
766 - Saint Martin
767 - Cayman Islands
768 - Panama
770 - Venezuela
780 - Brazil
781 - Chile
786 - Bolivia
790 - Argentina
810 - Australia/New Zealand
818 - Philippines
828 - Taiwan
838 - China
842 - New Zealand
871 - Hawaii
872 - Alaska
874 - Hong Kong
873 - Guam
888 - Hong Kong
900 - Japan
902 - AAFES, Germany
906 - Natex Retail, German NATO Airbase
907 - German NATO heartquarter
811 - Vanuatu