Armitron has basically two families of Semi-Retro LED watches. The first is the Griffy series with a stainless steel case that looks like it is straight out of the 1970s early LED watches. The reason why I call it Semi-Retro is because the LED readout is available in 4 colors, the classic Red, but also in Green, Blue or White and the displayed digits are much larger than on the 1970's watches. Digits are closer to 10 mm high versus the 3mm size on my old Hamilton LED watch. The digits on the old Hamilton were made up of many small LEDs while the digits on the Armitrons are large bar LEDs, 7 per digit. Due to magnification I suspect the edges of the displayed digits are fuzzier than on the classic watches too. Still easy to read and the larger size does eliminate the need for glasses for older eyes.
To operate press the upper button. The time is shown in HH:MM format for about 5 seconds. Press the button while the time is displayed and the date is shown in MM DD format. Press the button the third time, while the date is displayed, and seconds are displayed. All displays last about 5 seconds as LEDs are power hogs compared to LCD displays or the stepping motors used in analog quartz watches. An LED watch with red digits is a good choice for night time astronomy as the red color minimizes damage to night vision. Red is hard to read in bright light though such as trying to read the watch in sunlight. The Green is better for this use.
The bands are steel and quite thin so the whole watch is quite light weight. The band is length adjustable by sliding the buckle on the band so no removal of links is needed. Case finishes are Gold, Silver and Black. I have also seen both a rose gold and a silver and gold finish combination but these are not shown on the Armitron site currently. Amazon does show them.
Here is a link to the Griffy Watches at Armitron.
www.armitron.com
The second Armitron model is the Tetra which is only available direct from Armitron currently. Red LEDs only and a different shape case but the functions seem to be the same as the Griffy. 3 case finishes. The Tetras are more expensive than the Griffy watches.
www.armitron.com
Griffy Photo
Tetra Photo
To operate press the upper button. The time is shown in HH:MM format for about 5 seconds. Press the button while the time is displayed and the date is shown in MM DD format. Press the button the third time, while the date is displayed, and seconds are displayed. All displays last about 5 seconds as LEDs are power hogs compared to LCD displays or the stepping motors used in analog quartz watches. An LED watch with red digits is a good choice for night time astronomy as the red color minimizes damage to night vision. Red is hard to read in bright light though such as trying to read the watch in sunlight. The Green is better for this use.
The bands are steel and quite thin so the whole watch is quite light weight. The band is length adjustable by sliding the buckle on the band so no removal of links is needed. Case finishes are Gold, Silver and Black. I have also seen both a rose gold and a silver and gold finish combination but these are not shown on the Armitron site currently. Amazon does show them.
Here is a link to the Griffy Watches at Armitron.

Griffy® | 37mm, Gold/Red
Stranger Things fans to the front. The Griffy® updates Armitron’s original genre-defining LED digital watch from the 1970’s with a flashing red display that waits in sleek black sleep mode until activated by pressing the side button. Strap on this retro minimalist style and wear a piece of...

The second Armitron model is the Tetra which is only available direct from Armitron currently. Red LEDs only and a different shape case but the functions seem to be the same as the Griffy. 3 case finishes. The Tetras are more expensive than the Griffy watches.

Tetra™ | 36mm, Silver/Red
Tetra is funky reimagination of Armitron's original LED digital watch. The vintage-inspired oblong case design is finished with polished silver, gold, and black-plated versions. The flashing digital display waits in sleek black sleep mode until activated by pressing the side button. Strap on...

Griffy Photo
Tetra Photo