Hamilton were quite successful in persuading companies to use their watches for presentation purposes. They were also quite amenable to producing one-off designs for companies, so there is great variety in combination of hands, dials and cases.

Hamilton Armstrong Yellow 10K Solid Gold No back; crystal opening only; 34mm diameter incl. crown; Cal. 505; 1964ish	Hamilton Armstrong back	Armstrong Flooring company is still around today	Armstrong Flooring company is still around today	Armstrong Flooring company is still around today	Hamilton Armco; Armco Stainless Steel Case; No back crystal opening only; 36mm diameter incl. crown; Cal. 505; 1964ish
Case is made with Armco Stainless Steel!	Hamilton Armco	Hamilton Armco with Hamilton Nautilus 500; both have the Cal. 505 movement	Hamilton Armco with Hamilton Nautilus 500; both have the Cal. 505 movement

I really like this first one below...based on the Sea-Lectric II model, a presentation watch for the 54th Annual Governors' Conference held in 1962. This watch being presented to Governor Otto Kerner of Illinois by Governor David Lawrence of Pennsylvania.

The second watch is probably based on the Nautilus 400 and was produced in 1968 for the GREFCO company.

Hamilton 54th Annual Governors Conf; Stainless Steel Case; Screwdown Stainless Steel Back; 34mm diameter incl. crown; Cal. 505; 1962

Hamilton 54th Annual Governors Conf; Case based on the Sea-Lectric II

Hamilton 54th Annual Governors Conf; Case based on the Sea-Lectric II

Hamilton 54th Annual Governors Conf; Case based on the Sea-Lectric II

Hamilton GREFCO; Yellow 10K Gold Filled; No back; crystal opening only; 37mm lug-to-lug x 34mm width incl. crown; Cal. 505; 1968

Hamilton GREFCO; Case based on the Nautilus 400

It is not known which company ordered these "13" watches from Hamilton. It is based on the all stainless steel Nautilus 502 and contains the 505 movement.

The second set of photographs show a presentation watch for Central Power and Light Company (CPL) employees. The design is based on the Hamilton Aquatel B from 1962.

Hamilton '13' Nautilus 502; Stainless Steel Case; Open through the crystal; 34mm diameter incl. crown; Cal. 505; 1962

Hamilton '13' Nautilus 502

Hamilton 'CPL' Aquatel B; 10K Gold Filled Case; Open through the crystal; 34mm diameter incl. crown; Cal. 505; 1962

Hamilton 'CPL' Aquatel B