According to the Pill Identifier at Drugs.com, there is no white round pill with 357 imprinted on the surface. If you are talking about hydrocodone/acetaminophen, the pill is white and oblong or capsule shaped.
Is 4847
one generic form is a white oval pill with the marking m357 on one side
Generic pill for Doan's (The Backache Pill)
The white, oblong pill with imprint M357 is acetaminophen/hydrocodone 500 mg / 5 mg. The pill isn't made by Watson, it's made by Mallinckrod. I think you may just be mixing up the fact that it's a pain killer and normally would be made by Watson if it had an "m" on it.
Excedrin
It's Percocet 7.5 mg.
Neurontin also known as Gabapentin.
PT A515 - White Oblong Pill
Yes the white oblong pill, labeled G 31, is a generic version for Oxycodone 10/325.
M357 pills contain hydrocodone / acetaminophen 5mg / 500mg.
Those are Hydrocodone 5mg/500mg acetaminophen.
this does appear to be a networking question. A white oblong pill marked IP 272 is sulfamethoxazole, a generic antibiotic, equivalent to Bactrim.