Colnect-2128-996-ancient-and-modern-seismometers.jpg
Source: Colnect
  • Colnect-1256-050-100-years-HongKong-Observatory.jpg
Issued by: Hong Kong
Function: postage
Date: 11/23/1983
Issue: 100th Anniversary of Hong Kong Observatory
Denom: $5
Color: multicolored
Design: ancient & modern seismometers
Watermark: crown & CA spiral
Perf: 14.25
Catalog value:



External links:
Colnect 315845..ng_Observatory

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