Black and White Image of Silver and Gold Colored Badge

Obverse Design Top has perched eagle, wings spread, head ducked down and facing right. This eagle has the wings swept down below the feet, and body lower than the tops of the two wings. This eagle is holding a banner in its mouth which goes up on the eagle's left wing (the right of the image). The banner has incuse lettering of "1ST CLASS". The center of the shield has a gold colored circle with the first seal of the Canal Zone with a Spanish Galleon sailing through a sea level canal. Above the circle is a curving banner which has tails trailing up from either end. The banner has the word "CANAL ZONE". Above that banner is a smooth elongated hexagon with the word "POLICE". Below the circle is another banner with tails scrolled up at either end. This banner reads "PANAMA". Below the shield is a smooth square for the badge number of "180" in the example above. The shield overall has a textured background. The shield has a raised ridge as the edge.
Reverse Design Probably a pin back. To be determined.
Metal Unknown metal, probably nickel-plated brass. Color is silver except for inner circle which is gold colored. Size and Shape Width is 55 mm at the widest part of the shield and 58 mm at the wing tips. Height is 80 mm. That's about 2 1/8 inches wide at the shield by 3 1/8 inches high.
Dates Issued Exact dates not known. Based on the photo of a CZP officer in 1935 wearing the Canal Zone Police three bar no seal type of badge, and the use in 1941 of the diamond number badge, I would tentatively date this badge to the late 1930's. Note - Natalie Halpern was of the opinion this was from the 1904-1910 era.
Issurer The Panama Canal Company.
Numbers Issued Pieces include #180 above.
Rarity Rare. Manufacturer Unknown. Source Plumer Collection (ex-Natalie Halpern, 1985 sale for $85).
Varieties None known.

Police vest badge. I would appreciate e-mail from anyone who can add anything to the history of these badges.