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LettaSafe Letter Boxes  » Thames Postbox with Welsh Slate front

Thames Postbox with Welsh Slate front

Product code: LS12
Thames Postbox with Welsh Slate front-LS12
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Thames Postbox with Welsh Slate front
Total Price: £562.45
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Both functional and elegant, this letterbox has a high quality Welsh slate front which is carved with your house number or name and finished with a choice of white or silver enamel or 23¾ carat gold leaf. The mail is delivered through the front letter plate and retrieved from the lockable rear access door. The letter plate is available in a choice of white or grey finishes.


Post Boxes are designed to be fitted through:

  • outdoor walls
  • garden fences
  • brick piers.

When built into a cavity wall or pier, the mail is securely stored within the cavity area allowing the back casting to fit flush against the brickwork or rendering.

  • standard size fits a normal double brick wall
  • customised case sizes available to fit any depth wall or pier up to 900mm
  • the insert can be customised with a house name or number
  • letterbox supplied complete with 2 keys


Lead time for the LS12 is up to 15 working days. The collection box can be sent earlier (up to 4 working days) by selecting the delivery option.


Shipping weight:

20kg for standard size model.

Overal dimensions:

Mail collection container:- 295mm wide, 425mm high, 258mm deep (front to extreme back for standard size model, this can be extended up to 900mm)

Slate front:- 330mm wide, 460mm high (to top of apex), approx 20mm thick.

Overall depth when assembled 300mm


The front and rear castings including the door and flap are cast from pure aluminium in English foundries, whilst the main body is made from sturdy electro zinc coated steel. To ensure it's long lasting appeal, these components are thoroughly cleaned and primed before being phosphate treated and coated in a durable top quality low bake enamel in a choice of colours. All additional components (excluding lock) used are made from solid brass or stainless steel and assembled in England.

The slate is genuine solid Welsh slate and guaranteed to be free from cracking or de-laminating for a minimum of 25 years.

Exploded view of the Thames mailbox:

Exploded view of Thames mailbox

A) Pan head bolt (x4)

B) Letterplate

C) Slate front

D) Containing box front

E) Rubber seal (x2)

F) M6 Washer (x4)

G) M6 Nyloc

H) Centre sleeve

J) Nylon washer (x4)

K) Brass T Nut (x4)

L) Securing stud (x4)

M) Containing box back





LS12 Installation and Assembly Instructions

The LS12 Thames through the wall mailbox is designed to be installed into brick walls or brick piers from 215mm thick up to a depth of 900mm. The letterbox can be fitted into an existing brick wall or installed as the wall is being built.

Shown to the right is an sectional view showing the Thames postbox fitted into a 1½ brick wall.

Click here for installation instructions into an existing brick wall.

Click here for instructions to install the letter chute into a wall as it it is being built.



 LS12 Thames postbox fitted into a 1� brick wall



Lettasafe, Unit 4 MB Site,, Norwich Road, Norwich, , NR13 4EZ, telephone: 01493 753 288