EFFECT
PK5005. Prototype of the cheap MF camera. 4/5/6cm with collapsible lens tube. Simple Galilean finder. All controls are grouped on the lens. Shutter B, 1/8s - 1/250s with self timer and synch. T-22 4.5/75mm lens.
Produced: c.1955 Name: „Эффект“ Producer: GOMZ Frame size: 4.5/6 cm. Lens: Triplet-22  4.5/75. Shutter: 1/8s-1/250s + B. Quantity: unknown, but very few.   The picture of camera opposite and description taken from "The Authentic Guide to Russian and Soviet Cameras" by J.L.Princelle, 2nd edition, 2004.
	PK5005 - Effect prototype camera.
ESTAFETA
Produced: c.1957-1958 Name: „Эстафета“ Producer: GOMZ/MMZ Frame size: 4.5/6 cm. Lens: Triplet-35  4/75. Shutter: 1/8s-1/250s + B. Quantity: unknown, but very few. PK5015. Prototype version of the "regular" Estafeta camera (see picture opposite). Changed body design with an accessory shoe added on the top plate. New T-35 4/75 lens. Selftimer on the lens. Sample opposite from LOMO (Russia) archives.
	PK5015 - Estafeta prototype #570001.
PK5020. Short-run preseries version, identical to regular cameras already. Changed design of the shutter plate, T-35 4/75 lens. Selftimer on the lens.
	PK5020 - Estafeta preseries #58306.
PK5020 - two Estafeta preseries cameras.
PK5025. Camera identical to PK5020, but without selftimer already (unconfirmed). PB1405. Camera almost identical to PK5020, but released at MMZ factory in Belarus ("BELOMO" since 1971). An old MMZ logotype on the front (see picture below). Shiny mirror-like shutter plate. Released in 1958 only. Camera from Viktor Suglob (Belarus) collection.
	PB1405 - Estafeta camera.
PB1410. Quite common to find version of MMZ Estafeta. Camera identical to PB1405, but with less natty design of shutter plate already. At least 9000 cameras released in 1958-1961.
PB1410 - Estafeta manual.	PB1410 - Estafeta  #600724.
VYMPEL
Produced: c.1957-1958 Name: „Вымпел“ Producer: GOMZ/MMZ Frame size: 4.5/6 cm. Lens: Triplet-35  4/75. Shutter: 1/8s-1/250s + B. Quantity: unknown, but very few.
	PK5070 - Vympel prototype camera.
PK5070. Prototype version of more advanced camera Vympel (see picture above). This rangefinder camera has new shutter (speeds: 1s - 1/250s + B) and Triplet-33 3.5/75 lens. Only one sample is known to exist up to date. PK5073. Changed design of the top plate. Changed form of the shutter plate. Less fast Triplet-35 4/75 lens. Old sequence of the shutter speeds (1/8s - 1/250s + B). No serial number on an accessory shoe yet, only on the lens faceplate. Camera opposite from private collection in Europe.
	PK5073 Vympel preseries camera.
PK5075. Camera identical to PK5073, but with serial number on an accessory shoe already.  Less than 10 cameras are known to exist untill now. An earliest so far known camera has s/n #58571 (SovietCams).
The cover of Vympel manual guide (ultra rare).	PK5075 - Vympel preseries  #58571.
PB1500. Prototype camera very similar to PK5075, but released at  MMZ factory in Belarus ("BELOMO" since 1971). Less natty shutter plate. Only one Specimen is known to exist. Released in 1959. The picture opposite was kindly provided by authors of famous SSK book "1200 cameras from USSR", 2009.
	PB1500 - Vympel prototype camera.